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Old May 19, 2008, 2:59 AM   #1
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I received a new Sigma EF 530 DG ST Flash today but find the only way to get good histograms is when using manual exposure and dividing guide number.

Is this to do with an early K10D computer update thing or does K10D need a new chip or something or am I just stuck with doing manual exposures?

As the flash came from half way round the world a return is not a serious option.

Would really appreciate any advice on rectifying the problem.

Thanks: Ian McHenry
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Old May 19, 2008, 6:59 AM   #2
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Ian Mc wrote:
Quote:
I received a new Sigma EF 530 DG ST Flash today but find the only way to get good histograms is when using manual exposure and dividing guide number.

Is this to do with an early K10D computer update thing or does K10D need a new chip or something or am I just stuck with doing manual exposures?

As the flash came from half way round the world a return is not a serious option.

Would really appreciate any advice on rectifying the problem.

Thanks: Ian McHenry
Ian,

Sorry to hear that and I have to say it is a nightmare. 530 should match K20D not to mention k10d as it is the newer version of chip already.

I would suggest you try to test the flash with another Pentax dslrs either in a local camera shop and from another Pentaxian in NZ. Make sure your K10D works with other Pentax flash like AF360 or AF540 (again either in local camera shop or from another Pentaxian. Do they have any local Sigma centre in NZ ?

Daniel
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Old May 19, 2008, 7:14 AM   #3
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Ian

There were report of K10D cannot do fillflash in outdoor harsh light situation. And ST cannot do highspeed sync flash.

Does your 530 ST work ok indoor in perfect lighting condition?

Daniel
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Old May 19, 2008, 11:38 AM   #4
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What metering mode are you using?



The reason being is that the P-TTL is so new and sophisticated, that it can easily be fooled by a bright light, or a mirror.



Try the camera in spot, centre-weighted, and matrix mode.



All you need is 1 bright area and the flash will not give the correct result.



Also, if you are using a diffuser, then you will probably need to set the exposure compentastion to -1 otherwise the flash will output too much power.



Just a few thoughts





Dal
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Old May 19, 2008, 5:50 PM   #5
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First of all thank you Daniel and Dal for your advise and suggestions.

Situation is that when I set the K10D on "P" setting and focus on a subject regardless of the distance the lens says wide open. Have tried with different lenses and same result.

This indicates to me that either the distance measured by the K10D is not getting thro' to the hot shoe or The hot shoe information on distance is not getting through to the Sigma Flash.

Will be contacting Sigma agent to check on compatibility and also hope to try a Pentax Flash on K10D to check hot shoe is OK.

Will get back when I have more info.

Cheers: Ian Mc

PS The manual is pretty easy to use !!!! LOL.
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Old May 19, 2008, 9:47 PM   #6
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Well I finally got the Sigma Flash working reasonably well with Pentax K10D in Programme mode.

Solution; Spot metering and minus 2.0 Flash setting.

Cheers: Ian Mc
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Old May 20, 2008, 7:14 AM   #7
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Ian, not to rain on your parade, but that does sound like there is a real problem, either with the flash or the camera.

To have to spot meter and use -2.0 compensation is not right.



You should get both items checked out.





Dal






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Old May 20, 2008, 9:53 AM   #8
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Thanks Dal.

Appreciated.

Cheers: Ian Mc
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Old May 22, 2008, 7:22 PM   #9
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Took a recent trip to local botanics and now feel comfortable with combination.

K10D on Programme and multi-segment.

Just a question of using Histogram and compensating as required.

This image taken in a hot house with diffused overhead light.

Cheers: Ian Mc
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Old May 24, 2008, 7:48 AM   #10
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Ian Mc wrote:
Quote:
*Took a recent trip to local botanics and now feel comfortable with combination.

K10D on Programme and multi-segment.

Just a question of using Histogram and compensating as required.

This image taken in a hot house with diffused overhead light.

Cheers: Ian Mc
Ian

Seems that you are doing ok with 530. In normal, even and non-harsh lighting situation, the metering should be 95% right.

Daniel
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